The artist, who goes by the name Banksy, has surreptitiously hung works in the Metropolitan Museum of Art, the Museum of Modern Art, the American Museum of Natural History and the Brooklyn Museum.

A self-described "career graffiti writer" and "painter-decorator," Bansky tells Michele Norris that he consulted biographies of Harry Houdini to get ideas about how to sneak into the museums with his artworks, some of which are not small at all.

Asked why he carried out the pranks, Bansky says, simply: "I thought some of [the paintings] were quite good. That's why I thought, you know, put them in a gallery. Otherwise, they would just sit at home and no one would see them."